Veritas InfoScale™ 7.4.1 Virtualization Guide - AIX
- Section I. Overview
- Storage Foundation and High Availability Solutions in AIX PowerVM virtual environments
- Section II. Implementation
- Setting up Storage Foundation and High Availability Solutions in AIX PowerVM virtual environments
- Supported configurations for Virtual I/O servers (VIOS) on AIX
- Installing and configuring Storage Foundation and High Availability (SFHA) Solutions in the logical partition (LPAR)
- Installing and configuring Cluster Server for logical partition and application availability
- Supported configurations for Virtual I/O servers (VIOS) on AIX
- Setting up Storage Foundation and High Availability Solutions in AIX PowerVM virtual environments
- Section III. Use cases for AIX PowerVM virtual environments
- Application to spindle visibility
- Simplified storage management in VIOS
- Configuring Dynamic Multi-Pathing (DMP) on Virtual I/O server
- Configuring Dynamic Multi-Pathing (DMP) pseudo devices as virtual SCSI devices
- Extended attributes in VIO client for a virtual SCSI disk
- Virtual machine (logical partition) availability
- Simplified management and high availability for IBM Workload Partitions
- Implementing Storage Foundation support for WPARs
- How Cluster Server (VCS) works with Workload Patitions (WPARs)
- Configuring VCS in WPARs
- High availability and live migration
- Limitations and unsupported LPAR features
- Multi-tier business service support
- Server consolidation
- About IBM Virtual Ethernet
- Using Storage Foundation in the logical partition (LPAR) with virtual SCSI devices
- How DMP handles I/O for vSCSI devices
- Physical to virtual migration (P2V)
- Section IV. Reference
Virtual IO client adapter settings for Dynamic Multi-Pathing (DMP) in dual-VIOS configurations
Veritas recommends the following Virtual I/O client (VIO client) adapter settings when using Dynamiic Multi-Pathing (DMP) in dual-VIOS configurations:
Set the vscsi_err_recov attribute to fast_fail.
The virtual SCSI (vSCSI) adapter driver uses the vscsi_err_recov attribute, which is similar to the attribute fc_error_recov for physical fibre channel (FC) adapters. When this parameter is set to fast_fail, the VIO client adapter sends a FAST_FAIL datagram to the VIO server so that the I/O fails immediately, rather than being delayed.
Enable the vscsi_path_to attribute.
This attribute allows the virtual client adapter driver to determine the health of the VIO Server and improve path failover processing. The value of this attribute defines the number of seconds that the vSCSI client adapter waits for commands sent to the vSCSI server adapter to be serviced. If that time is exceeded, the vSCSI client adapter fails the outstanding requests. If DMP is present, another path to the disk will be tried to service the requests.
A value of 0 (default) disables this functionality.
To set the VIO client adapter settings
- Set the vscsi_err_recov attribute to fast_fail, and the vscsi_path_to attribute to a non-zero number. For example:
# chdev -a vscsi_err_recov=fast_fail -a vscsi_path_to=30 -l vscsi0
- Verify the settings.
# lsattr -El vscsi0 vscsi_err_recov fast_fail vscsi_path_to 30
- Repeat step 1 and step 2 for each vSCSI client adapter.